How did cyclist Lance Armstrong beat drug tests?

The seven-time Tour de France winner was at the center of “the most sophisticated, professionalized and successful doping program that sport has ever seen,” the United States Anti-Doping Agency said. To avoid detection, the USADA said, Armstrong used an IV saline infusion to dilute his blood, took the hormone EPO, for which there was no test, quit a race to avoid a test and hid from officials trying to administer random drug tests.